lawrence



(NQ Model.) Y

L. P. LAWRENCE.

` TOOL OPERATING MEGHAN'I-SM. No. 377,858. y Patented Peb. 14, 1888.

UNITED STATES APATENT OFFICE.

LOUIS P. LAWRENCE, OF PASSAIO, NEW JERSEY, ASSIGNOR TO THE LAW- `RENOE RAILWAY BRAKE COMPANY.

'TOOL-OPERATING MECHANISIVI.

SPECIFICATION forming pai't of Letters Patent No. 377,858, dated February 14, 1888.

Applica-tion filed March 7, 1887. Renewed January 14, 1888. Serial No. 260,749. (No model.) i

.To all whom, it may concern:

Be it known that I, LOUIS P. LAWRENCE, of Passaic, in the county of Passaic, State of New Jersey, have invented certain new and useful Improvementsin Tool-Operating Mechanism, of which the following isa specification.

The nature of my invention is the application of atmospheric pressure in contradistinction to pressure derived directly from steam, compressed air, or the like to mechanism forl operating punches, Ste.

The invention consists in the construction and combination of parts and details, as will be fully described and `set forth hereinafter, and then pointed out in the claims.

In the accompanying drawings, Figure 1 is a side view of a riveting-machine provided with my improved vacuum mechanism, parts being broken out and others in section. Fig. 2 is an end view of the same.

Similar letters of reference indicate corresponding parts.

The U -shaped rigid frame A is of the usual construction fsuch as is used in hydraulic riv'- eting-machines or punches--and on one arm of the said frame A a fixed die, B, for one head.

of the rivet is held, the other die, C, being held in a slide, D, mounted to reciprocate in a guide, E, projecting upward from the upper arm of the frame A. Said slide D is pivotally connected with the lower end of the arm F of a toggle-lever, F, which arm F is pivoted to the lower end of the upper arm, F2, of the toggle-lever F by the pivot F3, the upper arm, F2, of the toggle-lever being pivoted at its upper ends to two rigid standards, G, fastened to the upper end part of the frame A. A link or bar, H, is pivotally connected with the arms F F2 of the toggle-lever F, and the other end of said link'is pivotally connected with a hollow piston-rod, I, of a piston, J, contained in a cylinder, K, of greater diameter, the rim of said piston J being connected with the said cylinder K bya flexible ring, K. The pistonrod I passes through asuitable stuffing-box in one end of the cylinder K. A spiral spring, M, is contained in the hollow or tubular piston-rod I, one end of the spring resting against the outer closed end of the piston-rod and the other end resting against the opposite closed end of the cylinder. Said spring serves to press thepiston-rod in the direction of the arrow a', Fig. 1.

The t-ube O projects into that end of the cylinder opposite the one in which thepiston-rod I slides. Said tube also serves as asupport and guide for the spring M. The tube O is provided -with a three-way cock, O', and by means of the pipe Q, having any suitable coupling, the pipe O is connected with an ejector, R, which serves for creating a vacuum.

The operation is as follows: rIhe partsbeing in the position shown in Fig. 1, the heated rivet, passed through the material which it is to unite, is placed upon the vfixed bottom die,

B, and a vacuum is created by means of the ejector R. The cock P is so adj usted as to establish communication between the pipes Q, and O, wherebyavacuum is created in the cylinder, and the air entering into the cylinder through the aperture b forces the piston .I in

the inverse direction 0f the arrow a', whereby v the arms Fzf' of thetoggle-lever F are gradually brought in line and the upper die, C, is forced down with great force and forms the head on the rivet. Then the three-way cock is closed, so as to interrupt the communication between the pipes O and Q and permit air to pass through the pipe O into the cylinder, whereupon the spring M, which has been compressed, expands and forces the piston-rod in the direction of the arrow a', whereby the pivot F? is'moved inthe like direction andthe slide D and die Care raised. lThe movement of the die is very rapid and the pressure e51- erted by said die is very powerful.

It is evident that instead of using the machine for riveting it may be used for punching IOO as new and desire to secure by Letters Patent-- v 1. The combination, with a frame orrsupport, of a toggle-lever ou the same, a vacuumcylinder on the frame, a piston in said cy1inder, which piston is connected with the togglelever, and a too1-ho1der connected with the toggle-lever, substantially as herein shown and described.

2. The combinatiomwith a U-shaped frame or support, of a toggle-lever on the same,a Vacunmcylinder on the frame, and a, piston in said cylinder, which piston is connected with the toggle-lever, substantially as herein shown and described.

3. The conibinationmith a U shaped frame,

LOUIS P. LAVVR-ENCE.

Witnesses:

OscAR F. GUNZ, CARL KARP. 

